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Feasibility study for automatic reduction of phase change imageryThe feasibility of automatically reducing a form of pictorial aerodynamic heating data is discussed. The imagery, depicting the melting history of a thin coat of fusible temperature indicator painted on an aerodynamically heated model, was previously reduced by manual methods. Careful examination of various lighting theories and approaches led to an experimentally verified illumination concept capable of yielding high-quality imagery. Both digital and video image processing techniques were applied to reduction of the data, and it was demonstrated that either method can be used to develop superimposed contours. Mathematical techniques were developed to find the model-to-image and the inverse image-to-model transformation using six conjugate points, and methods were developed using these transformations to determine heating rates on the model surface. A video system was designed which is able to reduce the imagery rapidly, economically and accurately. Costs for this system were estimated. A study plan was outlined whereby the mathematical transformation techniques developed to produce model coordinate heating data could be applied to operational software, and methods were discussed and costs estimated for obtaining the digital information necessary for this software.
Document ID
19720008252
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Nossaman, G. O. (Bell Aerospace Co. Buffalo, NY, United States)
Date Acquired
August 6, 2013
Publication Date
January 1, 1971
Subject Category
Thermodynamics And Combustion
Report/Patent Number
NASA-CR-112001
Accession Number
72N15902
Funding Number(s)
CONTRACT_GRANT: NAS1-10598
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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